These plugs are NOTdesigned to be used in a cooling loop!!! The PrimoChill G1/4 Plastic Plug - White - 2 Pack are used to close ports on components for cleaning purposes or storage. Some radiators have more than 2 ports and require extra plastic stop plugs when using Rad Clean. These plugs can also help keep dust out if you plan on storing your parts. Features Clean and accurate G 1/4 threads. Specifications Material:Plastic Thread:G1/4 Included Parts 2x PrimoChill G1/4 Plastic Plug - White 2x Sealing o-ring Warnings These plugs areNOTdesigned to be used in a cooling loop!!! Not responsible for any hardware damage. Use at your own risk.